Hi, I'm trying to do some caculations involving numbers with big differences in their orders of magnitude. Unfortunately, all the cacluclating tools I can find always round off the answers too much to be of any use to me. For example, if I type 4.5 x 10-12 - (4.5 x 10-12 - 9.2 x 10 -30) I want a calculator that will give me 9.2 x 10 -30. But all the calculators I've used give me 0 due to unwanted rounding during the calculation. Even Python does this. Does anyone know where I could get a calculator or program that can do the calculation I need? I would prefer something with a simple interface resembling a hand-held calculator (like what Python uses) rather than something that requires any kind of programming. Thanks.